NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | SEE ALSO
#include <math.h>double infnan(int iarg);
Invalid, Overflow and Divide-by-Zero events are notified to the application by calls to infnan in appropriate places in libm. As exception-handling depends upon the operating system, infnan does not necessarily alter the current flow of control. Users of libm can design their own infnan.
Whenever an elementary function code in libm runs into an exceptional situation, or has to return an invalid result, it calls infnan(iarg) with an appropriate value of iarg ( ERANGE or EDOM ). The infnan function assigns the corresponding value to errno and triggers whatever exception mechanism is available. If given back control, it returns a non-finite value, which allows computation to resume, and prompts the user to consult the errno file.
ERANGE and EDOM are defined in errno.h.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
---|---|
Interface Stability | Evolving |
NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | SEE ALSO